[Coco] (Mega2) Was: new question/survey

[Stephen H. Fischer]

Hi,

I seen to remember that Mega2 was patched for 8 Megs at one time.

And MDIR was also fixed.

It may have been done when the real hardware 8 Megs was built, I forget the 
person and the name of the project.

--------------------------- 

Anyone: Have there been any reports of graphics screens corrupted with any 
type of CoCo with > 512?

I suspect that when they occurred the CoCo was just restarted or the program 
ended and restarted.

It takes a lot of memory pages to be allocated and the graphics screen 
started with the next largest block in the wrong place.

SHF


----- Original Message ----- 
From: "Bob Devries" <devries.bob at gmail.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Wednesday, January 20, 2010 11:51 PM
Subject: Re: [Coco] (Mega2) Was: new question/survey


> It seems from my experimentation that although the emulators can be set to 
> 8MB of RAM, NitrOS9's 'mfree' command hasn't caught up with that, and 
> currently shows only 2MB.
>
> Regards, Bob Devries
>
> --
> Besides a mathematical inclination, an exceptionally good mastery of one's 
> native tongue is the most vital asset of a competent programmer.
>
> Edsger W.Dijkstra, 18 June 1975
>
> ----- Original Message ----- 
> From: "Stephen H. Fischer" <SFischer1 at Mindspring.com>
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Sent: Thursday, January 21, 2010 6:09 PM
> Subject: [Coco] (Mega2) Was: new question/survey
>
>
>> Hi,
>>
>> I do not know which emulator you are using but there is a problem with 
>> OS-9 L-II with any memory size greater than 512 in both real CoCo's and 
>> emulators that I told Jeff about and that he addressed.
>>
>> Part of the fix was to run a small program called "Mega2" which Tony was 
>> the author and supplied it with his 2 Meg hardware kit.
>>
>> This program made some memory blocks busy so that they could not be 
>> assigned to graphics memory.
>>
>> I have not heard if NitrOS-9 built this in or if it has been addressed by 
>> any of the other emulators.
>>
>> This cannot be fixed in any real CoCo so except for automatically making 
>> these memory blocks busy, nothing can be done.
>>
>> SHF
>>
>> P.S. 1928K = 1.928 Meg, so I think your guess is bad.
>>
>>
>> ----- Original Message ----- 
>> From: "Wayne Campbell" <asa.rand at gmail.com>
>> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
>> Sent: Wednesday, January 20, 2010 9:15 PM
>> Subject: Re: [Coco] new question/survey
>>
>>
>> ...
>>> I just set the emulator to 8 megs to see what happens. MFree reports 
>>> 1928K of free memory, so I guess I have 8 megs.
>>>
>>> Wayne